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<a name="gst-plugins-good-plugins-rtprtxqueue"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-good-plugins-rtprtxqueue.top_of_page"></a>rtprtxqueue</span></h2>
<p>rtprtxqueue</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue--max-size-packets" title="The “max-size-packets” property">max-size-packets</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue--max-size-time" title="The “max-size-time” property">max-size-time</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue--fulfilled-requests" title="The “fulfilled-requests” property">fulfilled-requests</a></td>
<td class="property_flags">Read</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue--requests" title="The “requests” property">requests</a></td>
<td class="property_flags">Read</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstRTPRtxQueue"></a><div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue-struct" title="struct GstRTPRtxQueue">GstRTPRtxQueue</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> GstRTPRtxQueue
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.description"></a><h2>Description</h2>
<p>rtprtxqueue maintains a queue of transmitted RTP packets, up to a
configurable limit (see <span class="type">“max-size-time”</span>,
<span class="type">“max-size-packets”</span>), and retransmits them upon request
from the downstream rtpsession (GstRTPRetransmissionRequest event).</p>
<p>This element is similar to rtprtxsend, but it has differences:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>Retransmission from rtprtxqueue is not RFC 4588 compliant. The
retransmitted packets have the same ssrc and payload type as the original
stream.</p></li>
<li class="listitem"><p>As a side-effect of the above, rtprtxqueue does not require the use of
rtprtxreceive on the receiving end. rtpjitterbuffer alone is able to
reconstruct the stream.</p></li>
<li class="listitem"><p>Retransmission from rtprtxqueue happens as soon as the next regular flow
packet is chained, while rtprtxsend retransmits as soon as the retransmission
event is received, using a helper thread.</p></li>
<li class="listitem"><p>rtprtxqueue can be used with rtpbin without the need of hooking to its
<a class="link" href="gst-plugins-good-plugins-rtpbin.html#GstRtpBin-request-aux-sender" title="The “request-aux-sender” signal"><span class="type">“request-aux-sender”</span></a> signal, which means it can be used with
rtpbin using gst-launch.</p></li>
</ul></div>
<p>See also <a class="link" href="gst-plugins-good-plugins-rtprtxsend.html#GstRtpRtxSend"><span class="type">GstRtpRtxSend</span></a>, <a class="link" href="gst-plugins-good-plugins-rtprtxreceive.html#GstRtpRtxReceive"><span class="type">GstRtpRtxReceive</span></a></p>
<div class="refsect2">
<a name="id-1.2.210.7.6"></a><h3>Example pipelines</h3>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> rtpbin name<span class="gtkdoc opt">=</span>b rtp<span class="gtkdoc opt">-</span>profile<span class="gtkdoc opt">=</span>avpf \
   audiotestsrc is<span class="gtkdoc opt">-</span>live<span class="gtkdoc opt">=</span><span class="keyword">true</span> <span class="gtkdoc opt">!</span> opusenc <span class="gtkdoc opt">!</span> rtpopuspay pt<span class="gtkdoc opt">=</span><span class="number">96</span> <span class="gtkdoc opt">!</span> rtprtxqueue <span class="gtkdoc opt">!</span> b<span class="gtkdoc opt">.</span>send_rtp_sink_0 \
   b<span class="gtkdoc opt">.</span>send_rtp_src_0 <span class="gtkdoc opt">!</span> identity drop<span class="gtkdoc opt">-</span>probability<span class="gtkdoc opt">=</span><span class="number">0.01</span> <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">&quot;127.0.0.1&quot;</span> port<span class="gtkdoc opt">=</span><span class="number">5000</span> \
   udpsrc port<span class="gtkdoc opt">=</span><span class="number">5001</span> <span class="gtkdoc opt">!</span> b<span class="gtkdoc opt">.</span>recv_rtcp_sink_0 \
   b<span class="gtkdoc opt">.</span>send_rtcp_src_0 <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">&quot;127.0.0.1&quot;</span> port<span class="gtkdoc opt">=</span><span class="number">5002</span> sync<span class="gtkdoc opt">=</span><span class="keyword">false</span> async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p> Sender pipeline</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6</pre></td>
        <td class="listing_code"><pre class="programlisting">gst<span class="gtkdoc opt">-</span>launch<span class="gtkdoc opt">-</span><span class="number">1.0</span> rtpbin name<span class="gtkdoc opt">=</span>b rtp<span class="gtkdoc opt">-</span>profile<span class="gtkdoc opt">=</span>avpf <span class="keyword">do</span><span class="gtkdoc opt">-</span>retransmission<span class="gtkdoc opt">=</span><span class="keyword">true</span> \
   udpsrc port<span class="gtkdoc opt">=</span><span class="number">5000</span> caps<span class="gtkdoc opt">=</span><span class="string">&quot;application/x-rtp,media=(string)audio,clock-rate=(int)48000,encoding-name=(string)OPUS,payload=(int)96&quot;</span> <span class="gtkdoc opt">!</span> \
       b<span class="gtkdoc opt">.</span>recv_rtp_sink_0 \
   b<span class="gtkdoc opt">. !</span> rtpopusdepay <span class="gtkdoc opt">!</span> opusdec <span class="gtkdoc opt">!</span> audioconvert <span class="gtkdoc opt">!</span> audioresample <span class="gtkdoc opt">!</span> autoaudiosink \
   udpsrc port<span class="gtkdoc opt">=</span><span class="number">5002</span> <span class="gtkdoc opt">!</span> b<span class="gtkdoc opt">.</span>recv_rtcp_sink_0 \
   b<span class="gtkdoc opt">.</span>send_rtcp_src_0 <span class="gtkdoc opt">!</span> udpsink host<span class="gtkdoc opt">=</span><span class="string">&quot;127.0.0.1&quot;</span> port<span class="gtkdoc opt">=</span><span class="number">5001</span> sync<span class="gtkdoc opt">=</span><span class="keyword">false</span> async<span class="gtkdoc opt">=</span><span class="keyword">false</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p> Receiver pipeline</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="refsect2">
<a name="id-1.2.210.7.7.1"></a><h3>Element Information</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">plugin</span></p></td>
<td>
            <a class="link" href="gst-plugins-good-plugins-plugin-rtpmanager.html#plugin-rtpmanager">rtpmanager</a>
          </td>
</tr>
<tr>
<td><p><span class="term">author</span></p></td>
<td>Wim Taymans &lt;wim.taymans@gmail.com&gt;</td>
</tr>
<tr>
<td><p><span class="term">class</span></p></td>
<td>Codec</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="id-1.2.210.7.7.2"></a><h3>Element Pads</h3>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>sink</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>application/x-rtp</td>
</tr>
</tbody>
</table></div>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">name</span></p></td>
<td>src</td>
</tr>
<tr>
<td><p><span class="term">direction</span></p></td>
<td>source</td>
</tr>
<tr>
<td><p><span class="term">presence</span></p></td>
<td>always</td>
</tr>
<tr>
<td><p><span class="term">details</span></p></td>
<td>application/x-rtp</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.functions_details"></a><h2>Functions</h2>
<p></p>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstRTPRtxQueue-struct"></a><h3>struct GstRTPRtxQueue</h3>
<pre class="programlisting">struct GstRTPRtxQueue;</pre>
<p>The opaque <a class="link" href="gst-plugins-good-plugins-rtprtxqueue.html#GstRTPRtxQueue"><span class="type">GstRTPRtxQueue</span></a> structure.</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-good-plugins-rtprtxqueue.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstRTPRtxQueue--max-size-packets"></a><h3>The <code class="literal">“max-size-packets”</code> property</h3>
<pre class="programlisting">  “max-size-packets”         <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Amount of packets to queue (0 = unlimited).</p>
<p>Flags: Read / Write</p>
<p>Default value: 100</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRTPRtxQueue--max-size-time"></a><h3>The <code class="literal">“max-size-time”</code> property</h3>
<pre class="programlisting">  “max-size-time”            <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Amount of ms to queue (0 = unlimited).</p>
<p>Flags: Read / Write</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRTPRtxQueue--fulfilled-requests"></a><h3>The <code class="literal">“fulfilled-requests”</code> property</h3>
<pre class="programlisting">  “fulfilled-requests”       <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Number of fulfilled retransmission requests.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRTPRtxQueue--requests"></a><h3>The <code class="literal">“requests”</code> property</h3>
<pre class="programlisting">  “requests”                 <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a></pre>
<p>Total number of retransmission requests.</p>
<p>Flags: Read</p>
<p>Default value: 0</p>
</div>
</div>
</div>
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